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2 Sheets-Sheet 1 (No Model.)

F. GEISSL ER.

GAS REGULATOR.

*Patented Dec. 9, 1884.

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FRIEDRICH GEISSLER, OF DRESDEN, SAXONY, GERMANY, ASSIGNOR TO FREDERICKSIEMENS, OF SAME PLACE.

GAS-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 309,041, dated December9, 1884. Application filed March 26, 1884. No model.) Patented inGermany March 25, 1883, No. 25,487.

T0 whom it may concern Be it known that I, Fnrnnnron GEIssLER, a citizenof Saxony, residing at'Dresden, in the Empire of Germany, have inventedcertain new and useful Improvements in GasRegula tors, of which thefollowing is a specification.

My invention relates to that class of lamps for which Letters Patent ofthe United States were granted to Frederick Siemens on the 9th day ofJanuary, in the year 1883, in which the heat of the products ofcombustion from the flame is imparted to the air-supply, or to thecombustible gas, or to both, for the purpose of increasing theilluminating power of the flame, by causing such products of combustionand air or gas to pass in opposite directions through adjacentregenerative chambers or passages. In lamps of this class an an nularburner has its central space formed into a regenerative chamber orpassage, which communicates at its bottom with a passage or pipe leadingto a chimney, and is extended upward at its top beyond the level of theburner, and provided with guiding-surfaces, whereby the flame is spreadout to a considerable width. This inner chamber serves for the downwardpassage of the products of com bustion, which pass into it from the topof the flame, and are drawn downward through it by the draft of thechimney, into which the products of combustion escape after impart ing apart of their heat to the sides of the chamber. Surrounding the outsideof the burner is a second chamber, open at its upper and lowerends,which becomes heated. by conduction and radiation from the heatgiven off to the central chamber, and imparts such heat to the airpassing upward through the chamber on its way to the flame. On the upperend of the inner chamber, which terminates at a moderate height abovethe burner, is fitted a separate cylinder composed of any suitablerefractory material, which maybe renewed or replaced with facility.

It has been observed that when lamps of this description are cold theyburn but a small quantity of gas which is free from soot, and it istherefore necessary 011 first igniting to turn the cut-off cock in sucha manner as to allow a small quantity of gas to flow to the burner, andit is only by degrees that the continually increasing heating of theburner will allow of a corresponding increased gas-feed.

It is the object of my present invention to effect automatically asingle continuous and complete opening of the cut-off cook or reg-'ister corresponding to the maximum requirements of the burner, and tooperate automatically the continually increasing gas-feed in such amanner as to correspond to every degree of heat of the burner.

Gas-burners have been heretofore described in which a rod of brass orother highly-expansible metal is placed within a gas-conducting tube,which is exposed to the products of combustion and flame from the burnerfor the purpose of increasing the flow of gas as the parts becomeheated. According to my i11- vention, however, the expansible rod is soarranged as to be directly exposed to the escaping products ofcombustion, and the wall of the flue for the products of combustion isso constructed that its expansion assists the rod to operate the valvewhich governs the flow of gas. Some means should be provided foradjusting the length of the rod-as, for instance, a screw.

In the accompanying drawings, Figure l is a vertical section on the lineZ Z of Fig. 2. Fig. 2 shows a section on the line X Xof Fig. 1. Fig. 3is a section on the line Y Y of Fig. 1, and Fig. 4 is a section on theline WV XV of Fig. 1.

The gas is introduced through the pipe B into a chamber, G, terminatingat the top in an annular space, on which are fixed the small tubes 0,forming the annular gas-burner, the gas issuing from which enters intocombustion with the heated air passing up through the airchamber orregenerator F. The air for com bustion enters at the bottom of theannular chamber or regenerator F, and passing up through the latter,issues at the top in contact with the gas issuing from the tubes 0, andenters into combustion therewith.

On the top of the central flue, S, is fitted a separate cylinder, I, andring I,of suitable refractory material, which determine the breadth andheight of the flame. The downward draft of the central flue, S, causesthe combustiongases to be drawn inward over the upper surface of thecylinder and down through the flue S,whence they escape to the chimneythrough the passage B.

On the outside of the air-chamber F a second annular air-chamber, M, isprovided,open at the bottom, for the entrance of air.

The rod D, which should be constructed of some metal which is a goodconductor of heat, is combined, as is clearly shown in Fig. 1,wit-h thepart of the burner N which is exposed to the heat, and which extendsdownward from the passage B. The seat of the regulating device, in thiscase a simple hinge-valve, K,-is at or near the end of the gas-feedpipe, which is connected to the part of thelamp E. The upper end of therod D is provided with a regulating-screw, A, by means of which theposition of the rod may be accurately adjusted. When the lamp iscold,the valve K lets just so much gas through as the burner cancompletely consume when at that temperature.- With the increasing heatand consequent increased elongation of the depressed part N of the lamp,as well as of the rod D, the valve K is correspondingly opened, and thegas-feed thereby correspondingly increased. When the burner isextinguished, the valve K, the rod D, and

. the part N of the lamp return to their original positions.

I am aware that it is not new to apply the expansive and contractingpower of a metallic rod to open and close a damper which governs theadmission of air into a stove or other structnre; but my inventiondiffers from devices of this kind, as its object is 'not to reduce theamount of air required to support combustion as the heat thereofincreases, but to gradually increase the amount of gas required forillumination as the heat of combustion increases.

Instead of the hinge-valve K, illustrated in Fig. 1, any other suitabledevice which will effect the same purpose may besubstituted.

Although I-have selected a so-called regenerative lampin this instancefor the purpose of describing and illustrating the application of myinvention,it is obvious that the principle may be applied to otherlampsand structures which have been and may hereafter be'used.

I therefore claim and desire to secure by Letters Patent of the UnitedStates y 1. In a gas-lamp, the combination of an expansive andcontractive part exposed directly to the escaping products ofcombustion,- with a device normally open for in creasing the supply ofgas as the parts of the lamp become heated, substantially as described.

2. In a gas-lamp, the combination of a valve normally open, whichregulates the amount of gas admitted to the burner,with a metallic rodexposed directly to the heat of the escaping products of combustion foroperating said valve, to increase the supply of gas as the parts becomeheated, as and for the purpose described.

3. The combination of the walls of the flue, through which the productsof combustion escape from the lamp, a gas-regulating valve normallyopen, and a metallic rod attached to said wall and operated by theexpansion there of, to cause the opening of the valve to receive thesupply of gas as the parts become heated, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

FRIEDRICH GEISSLER.

